Thermonet in the detached house neighborhood of Bromarken, Jyllinge, DK - Stage D.
5G network
Picture credits: Damgaard Rådgivende Ingeniører
Facts at one glance
Status of the project:
Commercially operating
Operation mode:
Heating network
Geothermal source:
Shallow / Ambient Geothermal
Max heat capacity:
< 1MW
Network generation:
5G
Year of operation start:
2021
Contact:
kontakt@termonet.dk
Description of the project
The thermonet was incorporated in the price of the house and property for the new owners, hereby making the thermonet owned in parts by each household. A heating association is in charge of servicing the thermonet, while each household are in charge of their individual heat pump.
A total of 71 townhouses are a part of stage D at Bromarken, each with an individual heat pump. The outer part of the thermonet is made up of 10 vertical geothermal boreholes of 200 meters depth. The thermonet as a whole is a closed circuit, with a distance of other pipes in the ground to avoid freezing. The brine is a combination of 70% water and 30% IPA.
Experience from stage A of Bromarken has resulted in replacing the circulation pump in each individual heat pump with a regulation valve, and let the communal pumping station drive the brine on its own. This method makes for better control and is eventually more effective.
Highlights of the project
If for future thermonet, heat pumps with regulation vessels are chosen from the start, instead of bypassing circulation pumps, expences will be saved, as the pumps are more expensive than the vessels.
The biggest challenges / obstacles
A communal agreement on service of all the individual heat pumps could potentially reduce the costs of maintenance, compared to each household having an individual service agreement.
As the function of the thermonet is dependent on a continual flow of ½ m3 per hour, more electricity is being used than theoretically neccessary, which gives cause for improving effectiency.
Detailed characteristic of the project
Site description
Address
Ellenvej, 4040 Jyllinge, Denmark
Status of the project
Commercially operating
Year of operation start
2021
Type of geothermal Heating / Cooling network
Heating network
Type of geothermal technologies involved
Shallow / Ambient Geothermal
Are heat pumps used within this project?
yes - located at the clients
Heating network generation
5G
Number of clients supplied
10 - 100
Depth range
1-200
Involved companies
Planner / installer
Lind & Risør
Planner / installer
Damgaard Rådgivende Ingeniører
Driller
Geodrilling
Types of used geothermal sources
Source
Depth range
Temperature range
Purpose
Soil/rock - closed loop
< 20 meters
< 20°C
Heat extraction
Soil/rock - closed loop
20 - 400 meters
< 20°C
Heat extraction
System design
Heat sources included in the network
Monovalent - geothermal energy is the only heat source
Max heating capacity supplied by geothermal energy
< 1MW
Share of geothermal energy
70% - 80%
Annual operation hours for heating
2000 hours - 4000 hours
Annual heating production
< 1 GWh
Annual heating production share
70% - 80%
Energy conversion factor linked to the use of geothermal energy
< 5
Heat source for peak load supply
Geothermal
Has backup system?
Yes
Backup system
Electricity
Share of fossil fuels for annual gross heat production
0 %